Water heater



May 11, 1937.

H. J LONG WATER HEATER Original Filed June 27, 1936 INVENTOR.

, ATTORNEY.

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PATENT OFFICE WATER HEATER Herbert J. Long, Springfield, Mass, assignor to United American Bosch Gorporation, Springfield, Mass, a corporation of New York Original application June 27,

87,703. Divided and 1936, Serial No. this application October 10, 1936, Serial No. 104,953

3 Claims.

This invention, which is a division of my application Serial No. 87,703, filed June 27, 1936, relates to water heaters of the storage type, and more particularly to the heating unit of such a water heater and the heat insulating jacket structure surrounding the same. In my previous Patent 2,e19,45e there is disclosed a water heater of this general type and the present invention relates to improvements thereover.

The primary object of the present invention is to provide a heating unit and jacket structure which is easily constructed and assembled and which is therefore of relatively low cost.

It is a further object to provide a heating unit which may be readily removed from the jacket structure for repair or servicing.

It is a further object of this invention to provide, in a heater of this type, a jacket structure containing an insulating space which is com- 20 pletely sealed prior to its assembly with the heating unit, thereby avoiding any possible loss of insulating material or any deterioration thereof due to absorption of moisture.

Further objects and details of the invention will be more apparent to those skilled in the art from a consideration of the following detailed description taken in conjunction with the accompanying drawing which shows a longitudinal sectional view with parts in side elevation, taken through a heating unit constructed in accordance with the invention.

Referring to the drawing, the heating unit consists of a casting I having a central tubular member 2 connected by fins 3 with an outer cylindrical portion i. A tube 5 extends upwardly from the tubular member 2 and carries at its upper end a reduction joint 5. Studs 1 project radially from the lower portion of the reduction joint 5 providing spacing means between said joint and the heater casing. The reduction joint 6 is connected to a pipe 8 which leads to the upper end of a suitable storage tank, not shown, by a nut Si while the lower end of the heating unit is connected to the lower end of the tank by way of a short tube It which passes through an opening in the outer cylindrical portion 4 and is screw-threaded into an opening in the side wall of the central tubular member 2.

When the heating unit consisting of the casting I, tube 5 and reduction joint 6 are assembled, the unit so formed may be slipped easily into a separately formed jacket structure H. The jacket structure is of thin sheet metal and includes an outer cylindrical casing l2, having 55 annular end sheets l3 and I4 welded thereto and forming top and bottom plates. An inner cylindrical casing [5 of slightly larger diameter than the outer cylindrical portion 4 of the casting I and having inwardly projecting corrugations l6 thereon is welded to and extends upwardly from the annular bottom sheet M for a distance which is equal to or slightly less than the length of cylindrical member 4. A frusto conical member ll having its largest diameter slightly less than the internal diameter of cylindrical member 4 is provided with a base l8 which extends outwardly to the inner casing and is crimped thereto at it. Each of the parts l2 to 18 is of relatively light sheet metal and at each of the joints therebetween one of the members has a flange projecting therefrom in such a direction as to provide a surface parallel to the adjoining member to provide overlapping surfaces which may be easily crimped or stitch welded. The annular space formed between the outer casing l2 and the inner casing composed of parts l5 and ll is adapted to be filled with insulating material before being closed by end sheets I3 and it, and when so filled and sealed it is impossible for the insulating material to absorb moisture and thus lose its insulating quality. A cover 26 fits snugly upon but is detachable from the upper end of the outer casing I2. The cover 29 is cup shaped to provide a chamber 2| therebelow. A central opening 22 in the cover permits the upper end of reduction joint 6 to project therethrough, and the cover is also provided with a discharge passage 23 spaced between said central opening and its outer rim.

A gas burner 24 is positioned below the heating unit in a cup 25 which encloses the lower end of cylindrical member 4. Bayonet slots 26 are provided in the upper rim of cup 25 which slots coact with suitable studs 21 on the outer surface of said cylindrical member to hold the cup in position while permitting it to be readily detached for servicing. A lighting torch 28 is disposed within the cup 25 below the burner 24. to facilitate the lighting of the burner.

It will be apparent from the above description that the heating unit, the jacket structure and the burner assembly may each be separately constructed and that their assembly may be easily efiected by inserting the heating unit into the jacket structure where it will be rigidly held by the insertion of the tube It! through an opening in the jacket structure and in member 4 and screwing it tightly in the opening provided therefor in the central member 2. The burner assembly may then be quickly attached to the member 4 by means of the bayonet slots 26 and the resulting heater is ready for connection to the gas fittings and to the tank. The ease with which these parts may be assembled and disassembled results in considerable savings in manufacture and in servicing.

Having thus described the invention, what is claimed as new is:

1. In a water heater, a heat insulating jacket structure, a heating unit separate from said jacket structureand adapted for detachable insertion within said jacket structure, a burner assembly enclosed in a cup shaped combustion chamber and means for detachably supporting said combustion chamber from the lower end of said heating unit. 7

2. In a water heater, a heat insulating jacket 0 ing unit separate from said casing and having a lower cylindrical end portion, outwardly projecting lugs on the lower end of said cylindrical member, a burner cup having a lip telescoping with said cylindrical end portion and bayonet slots in said lip for detachably clamping said cup to said portion.

HERBERT J. LONG. 

